JMSDF JS SOURYU SS-501

The Sōryū-class submarines (16SS) are diesel-electric attack submarines that entered service with the Japan Maritime Self-Defense Force in 2009. The design is an evolution of the Oyashio-class submarine, from which it can most easily be distinguished by its X-shaped tail planes. The Sōryūs have the largest displacement of any submarine used by post-war Japan.
It is Japan's first AIP submarine. The class are fitted with air-independent propulsion based on Kockums stirling engines license-built by Kawasaki Heavy Industries, allowing them to stay submerged for longer periods of time. Some recent information suggest that the last units in the series will have their air independent propulsion systems replaced with banks of Li-Ion batteries.
The cost of the sixth submarine (Kokuryū) was estimated at 540 million USD. The 11th Soryu class submarine, with improved underwater endurance, etc. compared with the existing Soryu-class submarines by mounting lithium-ion batteries, was given a budget of ¥64.3 billion/US$536.7 million under the 2015 Japanese Defense Budget.
そうりゅう型潜水艦（そうりゅうがたせんすいかん、英語: JMSDF SS Sōryū class submarine）は、海上自衛隊が運用する通常動力型潜水艦の艦級。
海上自衛隊初の非大気依存推進（AIP）潜水艦であり、13中期防の4年度目にあたる平成16年度（2004年度）予算より取得を開始した潜水艦（SS）であることから、16SSとも呼ばれる。
Wikipedia
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